Chromatic properties (Type-IV)
OIV-MA-F1-08 Chromatic properties
Type IV method
- Principle of the method
The absorbance of the rectified concentrated must is measured at 425 nm through a pathlength of 1 cm after dilution to bring the sugar concentration to 25 % (m/m) (25° Brix)
Sulphur dioxide (Type-IV)
OIV-MA-F1-07 Sulphur dioxide
Type IV method
pH (Type-IV)
OIV-MA-F1-06 pH
Type IV method
Total acidity (Type-IV)
OIV-MA-F1-05 Total acidity
Type IV method
- Definition
The total acidity of the rectified concentrated must is the sum of its titrable acidities when it is titrated to pH 7 against a standard alkaline solution.
Carbon dioxide is not included in the total acidity.
Sucrose by high-performance liquid chromatography (Type-IV)
OIV-MA-F1-04 Sucrose by High-Performance Liquid Chromatography
Type IV method
Determination of the acquired alcoholic strength by volume (ASV) of concentrated musts (CM) and grape sugar (or rectified concentrated musts, RCM) (Oeno 419A-2011) (Type-IV)
OIV-MA-F1-03 Determination of the acquired alcoholic strength by volume (ASV) of concentrated musts (CM) and grape sugar (or rectified concentrated musts, RCM)
Type IV method
Hydroxymethylfurfural (HMF) by High-Performance Liquid Chromatography (Type-IV)
OIV-MA-F1-02 Hydroxymethylfurfural (HMF) by High-Performance Liquid Chromatography
Type IV method
- Principle of the Method
High-performance liquid chromatography (HPLC)
Separation through a column by reversed-phase chromatography and determination at 280 nm.
Conductivity (Type-IV)
OIV-MA-F1-01 Conductivity
Type IV method
- Principle
The electrical conductivity of a column of liquid defined by two parallel platinum electrodes at its ends is measured by incorporating it in one arm of a Wheatstone bridge.
The conductivity varies with temperature and it is therefore expressed at 20°C.
Recommendations related
OIV-MA-AS1-15 Recommendations related to the recovery correction
Recovery
“The OIV recommends the following practice with regards to reporting recovery of analytical results.
Recommendations on measurement uncertainty
OIV-MA-AS1-14 Recommendations on measurement uncertainty
Introduction